Good to know Szybowski From: bottomgun@mindspring.com To: personal_submersibles@psubs.org Subject: RE: [PSUBS-MAILIST] Hard Pontoon or Saddle Tank Options Date: Sun, 14 Dec 2008 19:37:33 -0500 Brent, If you have stray electrical currents (either emanating from your sub or in the vicinity) electrolysis can make these scratches catastrophic in an amazingly short time. R/Jay
Respectfully, Jay K. Jeffries Andros Is., Bahamas
As scarce as the truth is, the supply has always been in excess of the demand. -Josh Billings
From:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Brent
Hartwig
Jay, From: bottomgun@mindspring.com Brent, Nice floats…something you would need to be concerned about with this method is the strength of the aluminum piping struts. While towing your sub with these floats on the surface, frictional drag and wave slap will impart high loadings on the pipes. The longer the struts, the greater the moment forces will be at the juncture at the mounting point on the sub’s hull.
Another issue to be concerned with is the painting of aluminum. You are often better off leaving aluminum uncoated. Due to its high sacrificial nature in the Galvanic series, all of the sacrificial corrosion will be focused at a scratch in the coating’s surface vice evenly distributed over the entire aluminum structure when uncoated (i.e. a deep pit/crevice vs. a thin surface corrosion). R/Jay
Respectfully, Jay K. Jeffries Andros Is., Bahamas
As scarce as the truth is, the supply has always been in excess of the demand. -Josh Billings
From:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Brent
Hartwig
Vance, I came across my
friends rotary molded hard plastic fishing pontoon boat, that I thought you
might find of interest. These floats are can be mounted like saddle tanks
or further out in a sponson configuration with enough room to perhaps see down
between the main hull and the pontoons from the conning tower side
viewport. These can easily be cut open on the bottom to make them into
soft tanks, and add other things. These two models below, already have a
integrated rod attachment means, that I would suspect might make them
reasonably easy to attach to a sub with new SS rods. These floats can be sanded
and painted or even perhaps Rhino coated. I much prefer the shape of the Float Cat 75's. They look like they might track well when the sub is being towed.
Specifications for Hobie Float Cat 75 complete assembly
|